1 /*
2  * Copyright (C) 2020 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.systemui.media.controls.models.player
18 
19 import android.animation.Animator
20 import android.animation.ObjectAnimator
21 import android.text.format.DateUtils
22 import androidx.annotation.UiThread
23 import androidx.lifecycle.Observer
24 import com.android.app.animation.Interpolators
25 import com.android.internal.annotations.VisibleForTesting
26 import com.android.systemui.R
27 import com.android.systemui.media.controls.ui.SquigglyProgress
28 
29 /**
30  * Observer for changes from SeekBarViewModel.
31  *
32  * <p>Updates the seek bar views in response to changes to the model.
33  */
34 open class SeekBarObserver(private val holder: MediaViewHolder) :
35     Observer<SeekBarViewModel.Progress> {
36 
37     companion object {
38         @JvmStatic val RESET_ANIMATION_DURATION_MS: Int = 750
39         @JvmStatic val RESET_ANIMATION_THRESHOLD_MS: Int = 250
40     }
41 
42     val seekBarEnabledMaxHeight =
43         holder.seekBar.context.resources.getDimensionPixelSize(
44             R.dimen.qs_media_enabled_seekbar_height
45         )
46     val seekBarDisabledHeight =
47         holder.seekBar.context.resources.getDimensionPixelSize(
48             R.dimen.qs_media_disabled_seekbar_height
49         )
50     val seekBarEnabledVerticalPadding =
51         holder.seekBar.context.resources.getDimensionPixelSize(
52             R.dimen.qs_media_session_enabled_seekbar_vertical_padding
53         )
54     val seekBarDisabledVerticalPadding =
55         holder.seekBar.context.resources.getDimensionPixelSize(
56             R.dimen.qs_media_session_disabled_seekbar_vertical_padding
57         )
58     var seekBarResetAnimator: Animator? = null
59     var animationEnabled: Boolean = true
60 
61     init {
62         val seekBarProgressWavelength =
63             holder.seekBar.context.resources
64                 .getDimensionPixelSize(R.dimen.qs_media_seekbar_progress_wavelength)
65                 .toFloat()
66         val seekBarProgressAmplitude =
67             holder.seekBar.context.resources
68                 .getDimensionPixelSize(R.dimen.qs_media_seekbar_progress_amplitude)
69                 .toFloat()
70         val seekBarProgressPhase =
71             holder.seekBar.context.resources
72                 .getDimensionPixelSize(R.dimen.qs_media_seekbar_progress_phase)
73                 .toFloat()
74         val seekBarProgressStrokeWidth =
75             holder.seekBar.context.resources
76                 .getDimensionPixelSize(R.dimen.qs_media_seekbar_progress_stroke_width)
77                 .toFloat()
78         val progressDrawable = holder.seekBar.progressDrawable as? SquigglyProgress
79         progressDrawable?.let {
80             it.waveLength = seekBarProgressWavelength
81             it.lineAmplitude = seekBarProgressAmplitude
82             it.phaseSpeed = seekBarProgressPhase
83             it.strokeWidth = seekBarProgressStrokeWidth
84         }
85     }
86 
87     /** Updates seek bar views when the data model changes. */
88     @UiThread
89     override fun onChanged(data: SeekBarViewModel.Progress) {
90         val progressDrawable = holder.seekBar.progressDrawable as? SquigglyProgress
91         if (!data.enabled) {
92             if (holder.seekBar.maxHeight != seekBarDisabledHeight) {
93                 holder.seekBar.maxHeight = seekBarDisabledHeight
94                 setVerticalPadding(seekBarDisabledVerticalPadding)
95             }
96             holder.seekBar.isEnabled = false
97             progressDrawable?.animate = false
98             holder.seekBar.thumb.alpha = 0
99             holder.seekBar.progress = 0
100             holder.seekBar.contentDescription = ""
101             holder.scrubbingElapsedTimeView.text = ""
102             holder.scrubbingTotalTimeView.text = ""
103             return
104         }
105 
106         holder.seekBar.thumb.alpha = if (data.seekAvailable) 255 else 0
107         holder.seekBar.isEnabled = data.seekAvailable
108         progressDrawable?.animate = data.playing && !data.scrubbing && animationEnabled
109         progressDrawable?.transitionEnabled = !data.seekAvailable
110 
111         if (holder.seekBar.maxHeight != seekBarEnabledMaxHeight) {
112             holder.seekBar.maxHeight = seekBarEnabledMaxHeight
113             setVerticalPadding(seekBarEnabledVerticalPadding)
114         }
115 
116         holder.seekBar.setMax(data.duration)
117         val totalTimeString =
118             DateUtils.formatElapsedTime(data.duration / DateUtils.SECOND_IN_MILLIS)
119         if (data.scrubbing) {
120             holder.scrubbingTotalTimeView.text = totalTimeString
121         }
122 
123         data.elapsedTime?.let {
124             if (!data.scrubbing && !(seekBarResetAnimator?.isRunning ?: false)) {
125                 if (
126                     it <= RESET_ANIMATION_THRESHOLD_MS &&
127                         holder.seekBar.progress > RESET_ANIMATION_THRESHOLD_MS
128                 ) {
129                     // This animation resets for every additional update to zero.
130                     val animator = buildResetAnimator(it)
131                     animator.start()
132                     seekBarResetAnimator = animator
133                 } else {
134                     holder.seekBar.progress = it
135                 }
136             }
137 
138             val elapsedTimeString = DateUtils.formatElapsedTime(it / DateUtils.SECOND_IN_MILLIS)
139             if (data.scrubbing) {
140                 holder.scrubbingElapsedTimeView.text = elapsedTimeString
141             }
142 
143             holder.seekBar.contentDescription =
144                 holder.seekBar.context.getString(
145                     R.string.controls_media_seekbar_description,
146                     elapsedTimeString,
147                     totalTimeString
148                 )
149         }
150     }
151 
152     @VisibleForTesting
153     open fun buildResetAnimator(targetTime: Int): Animator {
154         val animator =
155             ObjectAnimator.ofInt(
156                 holder.seekBar,
157                 "progress",
158                 holder.seekBar.progress,
159                 targetTime + RESET_ANIMATION_DURATION_MS
160             )
161         animator.setAutoCancel(true)
162         animator.duration = RESET_ANIMATION_DURATION_MS.toLong()
163         animator.interpolator = Interpolators.EMPHASIZED
164         return animator
165     }
166 
167     @UiThread
168     fun setVerticalPadding(padding: Int) {
169         val leftPadding = holder.seekBar.paddingLeft
170         val rightPadding = holder.seekBar.paddingRight
171         val bottomPadding = holder.seekBar.paddingBottom
172         holder.seekBar.setPadding(leftPadding, padding, rightPadding, bottomPadding)
173     }
174 }
175